treewide: use log_*_errno whenever %m is in the format string

If the format string contains %m, clearly errno must have a meaningful
value, so we might as well use log_*_errno to have ERRNO= logged.

Using:
find . -name '*.[ch]' | xargs sed -r -i -e \
's/log_(debug|info|notice|warning|error|emergency)\((".*%m.*")/log_\1_errno(errno, \2/'

Plus some whitespace, linewrap, and indent adjustments.

src/bootchart/bootchart.c

@@ -285,7 +285,7 @@ static void do_journal_append(char *file) {
 
         f = open(file, O_RDONLY|O_CLOEXEC);
         if (f < 0) {
-                log_error("Failed to read bootchart data: %m");
+                log_error_errno(errno, "Failed to read bootchart data: %m");
                 return;
         }
         n = loop_read(f, p + 10, BOOTCHART_MAX, false);
@@ -434,7 +434,7 @@ int main(int argc, char *argv[]) {
                                         /* caught signal, probably HUP! */
                                         break;
                                 }
-                                log_error("nanosleep() failed: %m");
+                                log_error_errno(errno, "nanosleep() failed: %m");
                                 exit(EXIT_FAILURE);
                         }
                 } else {

src/bootchart/store.c

@@ -146,7 +146,7 @@ void log_sample(int sample, struct list_sample_data **ptr) {
                 /* block stuff */
                 vmstat = openat(procfd, "vmstat", O_RDONLY);
                 if (vmstat == -1) {
-                        log_error("Failed to open /proc/vmstat: %m");
+                        log_error_errno(errno, "Failed to open /proc/vmstat: %m");
                         exit(EXIT_FAILURE);
                 }
         }
@@ -178,7 +178,7 @@ vmstat_next:
                 /* overall CPU utilization */
                 schedstat = openat(procfd, "schedstat", O_RDONLY);
                 if (schedstat == -1) {
-                        log_error("Failed to open /proc/schedstat: %m");
+                        log_error_errno(errno, "Failed to open /proc/schedstat: %m");
                         exit(EXIT_FAILURE);
                 }
         }